Thanks for all the input.
These two small ponds that I have are not very deep. I can't eliminate them for a larger, deeper pond. They were actually perfect in size for what I wanted until the darn raccoons found them. I am sure the fish (sushi) are what finally attracted them to the ponds. The main reason I have fish is to eat mosquito larvae since here in Florida we seem to have lots of mosquitoes year round.
I don't know what I am going to do. I did consider weaving some rebar or some other thin metal posts through the wire mesh to keep it from bowing in the middle when a raccoon is on top of the cover. It might also make it heavy enough that it would be hard for them to move it. Another thought was a wooden plywood cover. I am so discouraged that there is a possibility I might have to give up water gardening because of the raccoons. Water gardening is something I have enjoyed with much success for years. And it is the easiest gardening I do because I don't have to worry about watering everything in the heat of summer. I just add water when needed. I love waterlilies! The fish were a really nice addition to the serenity of the ponds.
I may try making covers and see if that works. Only one way to find out. Hopefully it will work.